The Adafruit demos almost always crash.
If you can not identify the display you make insubstantiated claims.
In the world of Trump you can just lie through your teeth.
Seriously, please post a link to the actual display that you have bought. You will get accurate advice.
Even if you can't remember the purchase, you can search Ebay, Ali, ... for the identical item. Compare the link photos with the pcb on your desk. Then explain that it "looks identical" in "that" link.
Libraries are easier. You just say: Adafruit_GFX version x.xx and Adafruit_SSD1306 version y.yy with example
Yes, it takes a few minutes to use the Library Manager or paste the "usage" lines from the build report.
But you get the accurate reply within minutes or hours. (instead of multiple messages over days)
Yes, occasionally Adafruit release a duff version. But it is generally fixed quickly.
Yes, Oliver's U8g2lib is very good. Caters for lots of different hardware. We still need to identify your display so that we can advise the correct constructor.